I broke off my playlist tree browser into its own component, and changed the way it works a bit. It now offers browsing in a similar fashion to iTunes. This should be considered a BETA release.

* foo_browser adds 5 panels you can add to your columns ui layout, one each for Genre, Artist, Album and Title. Additional panels can be created in the preferences menu* By default, foo_browser shows the selection contents in its own playlist named "*Browser*"* Adds "Browse" to context menu which will populate all the panels from your selections * initially foo_browser will show entire library.